vgmstream/src/meta/2dx9.c

70 lines
2.1 KiB
C
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#include "meta.h"
#include "../util.h"
/* 2DX9 (found in beatmaniaIIDX16 - EMPRESS (Arcade) */
VGMSTREAM * init_vgmstream_2dx9(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[260];
off_t start_offset;
int loop_flag;
int channel_count;
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("2dx9",filename_extension(filename))) goto fail;
/* check header */
if (read_32bitBE(0x0,streamFile) != 0x32445839) /* 2DX9 */
goto fail;
if (read_32bitBE(0x18,streamFile) != 0x52494646) /* RIFF */
goto fail;
if (read_32bitBE(0x20,streamFile) != 0x57415645) /* WAVE */
goto fail;
if (read_32bitBE(0x24,streamFile) != 0x666D7420) /* fmt */
goto fail;
if (read_32bitBE(0x6a,streamFile) != 0x64617461) /* data */
goto fail;
loop_flag = 0;
channel_count = read_16bitLE(0x2e,streamFile);
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
start_offset = 0x72;
vgmstream->channels = channel_count;
vgmstream->sample_rate = read_32bitLE(0x30,streamFile);
vgmstream->coding_type = coding_MSADPCM;
vgmstream->num_samples = read_32bitLE(0x66,streamFile);
vgmstream->layout_type = layout_none;
vgmstream->interleave_block_size = read_16bitLE(0x38,streamFile);
vgmstream->meta_type = meta_2DX9;
/* open the file for reading */
{
int i;
STREAMFILE * file;
file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
if (!file) goto fail;
for (i=0;i<channel_count;i++) {
vgmstream->ch[i].streamfile = file;
vgmstream->ch[i].channel_start_offset=
vgmstream->ch[i].offset=start_offset+
vgmstream->interleave_block_size*i;
}
}
return vgmstream;
fail:
/* clean up anything we may have opened */
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}